RE: Why or why not?
Farm Country - I'm assuming your 10yr old Point Blank is the "New Wave". If so, don't expect to find a new bow that is much faster than that one with similiar weight arrows. I'm in the same boat right now .... I'm shooting a 12yr old Proline Point Blank "New Wave" and I haven't found a new bow that will beat it for speed yet. I haven't tried the BowTech Extreme or Patriot VFT's yet (with IBO's of 340 and 320), but anything with an IBO speed of 310 or less is either the same speed or slower than that old Point Blank! They are hard to beat.
Now, I will freely admit that these new bows have solid walls, more letoff, much less mass weight, and are quieter. Just don't be surprised if the speed isn't better than what you are getting now! This will be especially true if you are really dropping 3" off your draw length.
I've got a few more to test before I make a decision. Right now the Hoyt XTec is the only one that has made me say "WOW" when I shot it (have tried Hoyt UltraMag and XTec, AR34, PSE Scorpion, Buckmasters G2XL and will probably test some BowTech's shortly).
Ten years is long enough with that old bow ... it's time to put 'er out to pasture and move on. You can always keep it as a backup, since 10yr old bows aren't worth anything anyway. Good luck with your search .... Shockwave