First of all the Bitcoin is immortal and it can't ever dead because it is the data written in online but it is impossible to erase this data without the permission of the owner of the Bitcoin network , so end of Bitcoin is impossible .
But in my opinion the Bitcoin is going toward the limit of the 21 millions so it may be possible that is the reason why they want to make another coin comparable to the Bitcoin and more impactful sppeder faster network chain .
But here the main thing is that segwit is replaced by the segwit2x( results into two chain one for the btc and second for the another coin ) but here only 80% of the chances are for the launching to work successfully . So here it is possible may be they don't launch segwit2 and renew the segwit ( old ) with the improvement and with better response with big block size .
( Here all arey opinion and according to the news that is spread in my friend circle about it ) .