That's a good point; personal speculation on that part. If skimming down on the size is a possibility though, they will take it since that means less plastic, meaning less costs on that end. Every penny saved counts.
Not necessarily. Sony seem like they'll have trouble with supply meeting demand until at least March 2022. That's going to impact software sell rates and, therefore, revenue and net profits.
Depending on how much those are suppressed (dunno if they will scale back on regular PS4 production to shift that budget towards amping up PS5 production supply?), they prob don't want to cut into revenue & profit growth by chopping the MSRP down which could incur bigger losses.
But it really all depends on what their pricing for components, contracts for wafer production and components (and what room they can have in changing parts of those contracts) etc. are. Things we just aren't privy to knowing.
Is that clock speed speculation in relation to CPU or GPU?