Before we start - these are my thoughts only.
This will encourage them to pay through the nose for the LTE spectrum because they'll know they can make serious coin on it..
Very very unlikely. Look at it this way, you put your hand in the fire and got burned, would you do it freely again? The networks won't fork out huge sums of cash without better deals this time around and a much more better interim would be to re-locate some of the load of the 3g network to the 2g bands (900/1800mhz)
HSPA+ is a generic term - HSDPA (or U) is just a carrier. Its speed goes pretty high and in excess of what most people need for mobile use (this is not the same as mobile bb) - don't expect LTE to just arrive all that quickly because the changes to the backend that need to be made are huge.
Zarf you also imply that having capacity generates revenue when really, i doubt it does. If I have the capacity to give all mobile users 40mbit lets say, what happens when they all use 10? or 15? This is a pretty real situation for mobile use, the availability of fast speed has to be matched with the users requirements which tbh, arn't all that amazingly high currently. Yes, we are using more and it grows a lot but the real issue isn't so much bandwidth - it's other technical factors.
Backend - needs to be overhauled and redesigned with every network release
Cell tower - need more of em :/ 3G cells natural shrinkage won't go away with LTE
Cell links - Network interconnects need upgrading with each jump of data usage
This is not to say there won't be an upgrade, it's just that it has to exhibit a return on investment for it to be worth it to any network and considering how well HSDPA scales, going LTE isn't such a rush. Also LTE doesn't carry voice yet. This may sound trivial but means it will require a decent workaround or a move into voip in the medium term too.
Don't get me wrong, I'd love for it to go LTE tomorrow, mobile BB allowances to be in the 50gig range and all sorts of nice things, but I fear this is a few years away (or 5).