You mean like the 208 LRHT @ 3000 with a bc of .364? Or how about a 212 eld-m @ 3000 with a .359 bc? That would be a 300 win mag. Compare that to the 7 prc shooting a 184 hybrid with a bc of .362 @ 3000 fps, or a 180 eld-m with a .360 bc @ 3000 fps......7 prc doesn't buck the wind any better. It has less bullet mass though, not necessarily the best thing for elk. It does however have less recoil, which may matter if you don't want to put a brake on your rifle. It will have some decent factory loaded options, which is a good point for some. There is no good brass options at this point, though by the time you would get there I bet adg or someone will be making 7 prc brass.
Not saying a 7mm won't kill elk, it absolutely will, we have killed a bunch of them with a 7mm and even a 6.5 at extended ranges (900+), however if you already have a good 300 wm....as an elk rifle, there isn't really a *practical* reason to rebarrel it into a 7 prc, other than to lower recoil. In a Tikka specifically, it may make sense to do it so you have more room for bullet seating when you handload, that is logical. However based on performance alone, the 7 prc simply is not better than a 300 wm. I know it's a ways down the line before a rebarrel on a gun you don't even have yet, but just something to chew on.
As far as rifle options, I think your on the right track. For factory options, browning also isn't a bad choice, I have worked on a couple x-bolts and a-bolts that absolutely hammered, specifically a 7mm rem mag, 270 wsm, 300 win mag and a 28 nosler, but the downside to them is far less backing for aftermarket support. For the most options down the road, I would look at the CA.