Price increases are inevitable, especially as we watch prices for everything around us get 10 to 25% price hikes. Heck my weekly Chinese meal delivered to the door has gone up from $35 to $59, so we can expect this to happen. The real question is whether it has exceeded the value you place on a phone.
For me I jumped off the yearly wagon and look at replacements only every two years or so. This is simply because the year on year changes are too incremental and generic. I still run an 11 Pro Max (my main phone is an 14 Pro Max) as one of my back up phones and it is more than adequate and, indeed, better than the 14 Pro Max in a number of ways (smaller, lighter, easier to hold) and is more than adequate for everything I do (phone, emails, texts, home systems control, bank accounts etc.). I have the 14 Pro Max because it has satellite communications and that is the only reason. I thought I might need it, but it ended up not being useful to me. My bad.
Unless the 15 is lighter, has a longer battery life and is better shaped for my hand, I will give it a pass as those are my personal reasons where there might be some value in an upgrade, otherwise I will wait. The question is whether those benefits, if they come, are worth what Apple will charge at the time. Only you can decide. Apple will soon discover whether their value proposition offered by a new phone fails to meet customer expectations and sales fall. Unlikely I think, but we all make our personal choices and I would not attempt to convince anyone that my personal choices and value I place on a phone should be theirs.