Do you think Bitcoin is completely finished since the developers will no longer work on it and are suggesting to use alternatives including Bitcoin Cash?
Is this ship going to sink completely and the coins will be more like memorabilia?
no its not, thats why we are still seing forks and segwits because they are still working on it and keeps on improving bitcoin and no, they are not suggesting people to use some kind of alternative coins like bitcoincash just because they think that bitcoincash is better than bitcoin. this ship is not going to sink even if no more developments will occur, bitcoin will still be used just like a regular currency to buy or sell online and offline.
