I couldn't agree more with your statement. Planet Hulk was a beautiful creation. Sending Hulk into space for an extended period of time was just what the Jade Giant needed to reinvigorate his title. The one mistake was sending him back to Earth the World War Hulk debacle. If it were up to me (and sadly it is not), I'd have left the Hulk in space for many more years - putting the whole exile thing into much grander perspective. Imagine if the Hulk were to show up five, six years down the road instead of one year -- now that's an impact!
We can only hope a team like DnA takes on the new Hulk series. It would be nice to see him return to the cosmic side of Marvel, but I know that won't happen.
It's almost like anytime anything is good, MARVEL just had to find some way to weave it into their other titles. I don't have an issue with the idea itself but their execution doing this seems to historically be bad. I don't have the numbers but I bet they probably indicate that MARVEL made the right decision, but as a reader, here you had the HULK, a classic MARVEL character, finding new life on a totally different tangent that still spoke to a symmetry regarding the original character and his place in humanity. It both kicked ass and was thoughtful. It was just good funny books that got caught up in the "this is good, let's fuck it up and make short term cheddar while we have a little buzz" meeting. I agree with you and think this would have been great - thought not in the form they went with - years down the road with him coming back and just ruling everything. Let the Jade Giant get his Thanos on or something. I mean the worst thing you can do when you have a good story is find a way to make the Sentry significant in it. Sometimes, just leave shit alone. Hulk went from a top stack book to...I don't know...red or something.
The problem is, and admittedly since this is the Hulk it would not be the case, when they DON'T do this, they tend to cancel good titles short like a Captain Britain MI:3.