It's difficult. But he might do it. But even if he does it in the same particular style he's been doing the last 2-3 years, i doubt people will remember him the way they remember MS.
Well, that's because Michael did somehting no one else thought... Go to Ferrari and put on some stunning drives in a rather inferior Ferrari of the mid-late 1990s. I mean, would Michael be remembered if he stayed at Benetton (could have or went to Williams instead of Ferrari, which had the best cars from 1996-1999, he would have won the championships from 1994 to 1998, if he stayed at Benetton to 1996-1997 seasons when they had Renautl Power and had Ross Brawn influence. He could have been a 4-5 time WDC by 2000.
But he chose Ferrari for that great challenge... and it paid off.
Therefore, if Seb wants to be like Michael, he has to go to another team, maybe Ferrari and win a title there.