Actually, Feint is good to have even at higher levels.
1) Most monsters do *not* have Sense Motive.
2) Most higher CR monsters tend to have high attack bonuses, but not so high BAB... (For example, a Pit Fiend has a CR of 20 and a claw attack with a +30 to hit, yet only has a BAB of +18, which a 15th level rogue with a 0 Cha modifier could actually match, using no feats).
So, if you keep putting skill points into bluff, maybe take a feat like persuasive, and boost your charisma, there's no reason *not* to feint enemies at any level. Sure you'll run into stuff you just won't be able to feint (just as every class seems to have enemies they just don't do well against), but it's hardly useless.