Sorry, just don't see the chemistry there. Predict one season tops.
Edit to add my reasons why this move is doomed:
1) Ashton Kutcher is a one trick pony. His schtick was funny enough in That 70's show, but it ain't gonna work in this scenario. He just doesn't have the chops to pull off the "Charlie" role.
2) They already have a hapless buffoon on the show. Is Alan going to take over the "Charlie" role? Riiight.
Ashton Kutcher has officially won.
The former "That 70's Show" and "Punk'd" star has agreed to join "Two and a Half Men" as Charlie Sheen's replacement, The Hollywood Reporter relays. He's putting the final touches on his contract, which will offer him a "huge payday," according to THR.
Rumors around Kutcher's casting began to swirl earlier on Thursday. He most recently starred in the romantic comedy film "No Strings Attached."
A little after 9 pm, Kutcher simply tweeted: (-;
Kutcher replaces Sheen, who, after having helped make the show the number one comedy on television, was fired for a long set of rants against the series' creator, Chuck Lorre. He has since gone on to mount a very public life with his porn star girlfriends, continuing to rail against Lorre and CBS in his "Violent Torpedo of Truth" road show. At one point, he said he wanted old friend Rob Lowe to replace him.
http://www.huffingtonpost.com/2011/05/12/ashton-kutcher-joins-two-and-a-half-men_n_861389.html