tough call. i really enjoyed Angle's run with the WWE and am currently enjoying his run in TNA. he's been very arguably the best acquisition in the history of the company and he really is the face of TNA. i remember reading an article years ago that stated Angle could be for TNA what Hogan was for WCW. that seemed very fitting to me and very realistic. in the same article, the title was "6 sides but only 1 Angle" and was a reference to the then six-sided ring. it was pretty accurate though because we all know that there is only one Angle.
his feuds in WWE with Austin, Triple H, Rock, Brock, Benoit, Eddie, JBL, HBK, Big Show, and countless others were all pretty great.
but i am seriously loving his new angle (no pun intended) with working his way up the poll ladder. his matches will all be pretty awesome and always set the bar high. he has the ability to win a match without making the opponent looking bad and the ability to lose a match without looking bad himself. he is on a very small list of people that can do that well and effectively.
his matches with Samoa Joe (the headbutt heard 'round the world was epic!), Sting, Christian, AJ Styles and Mr. Anderson have all been great. and again, his new angle is pretty awesome and i'm super looking forward to seeing him at the #1 spot. great stuff!
but to answer this question, i really could go 50/50 on it. whether or not i think Angle ever would or will go back to WWE (i doubt it, unless it's a Mania send-off for his Hall of Fame deal) is not really relevent. there are a lot of things i want in wrestling that may or may not ever happen. and this could be one of them.
however, i will say this. if Angle ever did return to the WWE and in the very soon future specifically, the feuds i would be most looking forward to would not be with Orton, Sheamus or Triple H. maybe another Cena feud would be okay, but even that is not what i'd most like. i'd be thinking like another extended feud with Edge, Christian, Jericho, CM Punk and Mysterio. with Edge and Christian, he already has some history (especially with Christian in TNA), he's had some good encounters with Jericho and easily could put on some great matches, CM Punk could be pretty awesome and then do some stuff with Mysterio. i think all of those would be worth watching.
on that note, why not give him a match against Taker at Mania? he'd be a very credible threat to the streak and would possibly be the show stealer of the year. just some thoughts. i voted "yes" just because i'd like to see one last run, but i doubt it'll happen, especially in the near future. the guy is the top draw in TNA and it's easy to see why.