Nah this is incorrect, I'd say the worst moment for marxism was after 1989 with the fall of the "socialist" block, lot's of parties troughout the world dissolved (the majority of the ones that stayed were the one that previosely denounced soviet revisionism to some degree).
But since then Communist movements had actually gained traction all troughout the world, I'd explain this by four principal groups I'd say, depending on were you look:
Socialist revolutions specially in the thirld world countries (such as the Naxalites in India, the Maoists who deposed the king in Nepal, the growing New People's army of Philiphines….. even some smalller groups such as the Communist party of Lebanon, or some like the DHKPC or MLK in Turkey, to give just a few examples.
Also there is the Civil war in Syria with Rojava (I still hope they implement a socialist line when they have more stability, and are not actually just an American tool.)
Then you have to look a Latin America, here the economic and social conditions had provoked progressive leaders reaching the presidency of lots of countries, and although they are not implementing socialism (does not matter what they say), they have an antiimperialist line, and are creating in some way in my opinion the path for future socialist movements.
Of course there is the first world, were as said at the start , socialism was in it's worst days after th USSR collapse, but later there have been certainely a reappearence of socialism as an alternative in the public mindset, with parties sucha as the KKE in Greece, PCP in Portugal, Akel in Chipre, PVDA in Belgium, as some examples in Europe, of parties growing in popularity electoraly (by participating in burgeoise democracy) but most importantly on the streets. Also, seriousely haven't you realized Socialism/Communism is gaining popularity?? In America depite the right wing reactionary groups coming back to public displays, there is a fastly growing number of people joining or supporting socialist organizations, realizing that maybe what they had told them about socialism was not true.
This is happening also in Europe were although not Communists directly, events like the recent British elections were the most left-wing candidate in Labour history was able to break the Tory stablishment, show socialism in gaining support.
Then about self-proclaimed socialist states such as Cuba, DPRK, China, Vietnam and Laos, in the case of the first two this is still correct (to some extent, as they only can do so much being completely isolated) and are still mantaining themselves as a beacon of Antimperialist resistance (despite their terrible mistakes, specially by the DPRK).
China is in a courious situation, were although it is a capitalist country ( can't understand why people argue otherwise) it seems that there is a current in the CPC that seeks to start implementing socialism again,as the official statment of the party says (don't really now though if there truly is), and lot's of countries trough the world see them as the example to follow,as USA influence unavoidably decays, also China still supports socialist and progressive movements troghout the world (maybe just because of their interests, but this still helps the people).
Finally kinda related to all past points Communist parties are staring o organize themselves again in the international level, with meeting such as the IMCWP en.wikipedia.org/wiki/International_Meeting_of_Communist_and_Workers'_Parties were most relevant communist parties around the world are organizing again for a global strategy, being bigger each year, or the WFDY en.wikipedia.org/wiki/World_Federation_of_Democratic_Youth communist youth mettings (this year one in Sochi has been the biggest ever)
And this just talking about palpable examples, withouth entering topics such as the falling rate of profit, the unsusteinable growing inequality….Socialism will come, maybe in 20 years maybe in 200 but it will.
Because remember bucko , as Dimitrov said:
"The wheel of History wil keep wheeling until the final victory of Communism"