There is a nice thread on the Eve-O forums speculating on the landgrab that might come, once Planetary Interaction goes live: http://bit.ly/b6peyb.
According to that thread there are 194 players for each planet in hisec. But not everybody will try PI. And a lot of people will dabble in it at first and forget about it as it takes a bit of work and it might not be everybody’s cup of tea.
It will probably pay off to look for some juicy planets in low sec. I might have to dust off my blockade runner ;).
And let’s not forget about all those planets in 0.0. I think it’s a safe bet to say that there will be a good sized rush for planets in nullsec as well, albeit not nearly as large as the one in hisec. Carebears these days…
I am deffinatly going to try P.I. in low sec, more risky but I think the rush in high sec is going to be crazy at first