@Andrea_Mo3 - First of all, you’re forgetting that memrise isn’t all languages. I’m doing various courses on geography, history, science, and nature. For example, I’m not about to start “using” the locations of all those tiny Pacific islands on a daily basis, ever, but I still like knowing where they all are when any of them come up in the news or conversation - even if it’s an island I haven’t heard mention of in a few years outside of Memrise. For another example, my own tropical fish identification course will help me identify those rare fish I hardly ever see while diving, or fish from faraway places where I don’t travel to very often. As long as I keep up on my review, and brush up on the ones I get wrong so I can learn them better.
Secondly, even when it comes to languages, it’s useful to have some vocabulary in my head for languages I’m not about to learn to speak fluently anytime soon. And to keep up in my practice on reading their alphabets. For example, I do intend to visit Korea again, but it may be many years before I do that. If I’m keeping up on my review here, even if I don’t actually try to learn Korean, I will be able to read and understand a lot of signs and menus and other useful things the next time I go there. And if I do decide to actually learn Korean, most likely I’d make that decision at the same time I plan my next trip, so maybe I’d have six months - not enough to really speak the language, but if I have the massive head start of already knowing lots of vocabulary and short phrases from memrise, it would make those six months much more effective.
And then there are languages I have learned, or am learning, such as French - I speak it reasonably well. For a language like that, memrise has courses on more advanced vocabulary, and on idioms and sayings and expressions. Since I don’t actually live in a French-speaking country, I’m not going to encounter those sorts of things often, but if I keep on reviewing, then once a year or so when I do visit a French-speaking country, I’m better prepared to understand the less common words and expressions that will come up, and that I may not have actually used before, or not used for years.
So yes, I do plan to keep on reviewing for years, for the things I’ve learned here, in order to maintain my knowledge. If only memrise didn’t make it so cumbersome with their 180 day buildup of things I’ve learned really well already.