With Meow ideas I'll have about 100 hp.
Eh... eh eh eh eh eh eh eh
Oh and I have WM too, so no risk of losing that much WPF.
Feel free to do that Meow 
Meow said you only get HP from IF, not from strength. You would actually lose a substantial amount of HP
That means at level 30 you will have 35 HP pre-Ironflesh.
That means the absolute maximum HP you could get with a level 30 build (39-3 13 IF) would give you 87 HP.
Currently a 21/18 build w/ 4 IF has 64 HP. With Meow's proposed changes that same build would have 51 HP.
The change would be bad; I don't feel like I need to explain all the reasons why, but for starters survivability would plummet which means ranged & heavy cav would get a substantial buff.