I think the one thing I am not seeing much discussion on is, will the end consumer pay for these $150 sneakers or will they simply switch to lower cost alternative brands?
fun fact: sneakers are already $150. went shoe shopping at a "sketchers warehouse" and found a pair that fit well and noped them back on the shelf when I checked the price.
Unless you're getting goretex or leather (and even then, shoes are small), there's not really anything in a shoe besides a bit of rubber, some EVA foam, and probably some plastic mesh. The materials cost is very low.
The assumption in the modelling is that sales will decline proportional to the price increase. IOW, they'll sell 2/3 as many shoes at 150% of the price.
Probably not a great model, but it's simple and a reasonable guess. Remember all the competitors will have price increases too.