You do not know how much Konami IPs cost or which ones Sony would possibly even buy. There's too many assumptions in your post.Sony is not paying the insane price the IPs would cost. Konami won't sell them for peanuts, either. There is literally no reason to buy IPs for Sony.
It makes a lot more sense to just licence the ones they are interested in.
If Bluepoint just wants to remakes MGS because they love that game, just licence it from Konami. Why would you pay hundreds of millions of dollars to own it if you have no team to keep working on the franchise.
Also, people have to let Crash go. Sony will do what's best for business. If they think it makes sense to have a huge horror IP exclusively on their platform, they will fund Silent Hill, even if they don't own the IP. It won't bite them in the ass.
Where I'm getting at is that it's much more likely that Sony would buy some of their IPs rather than the company itself. If it went there. And I personally do not see them licensing out Konami IPs as a real strategy. Maybe one or two for a couple of games, ad-hoc basis and no massive money investment needed.