going by mtgtop8 prices here. scraped from tcgplayer average, so not real prices, but to be comparable:
dredge is 5-6k, which is almost entirely bazaars.
powerless eldrazi is 1200-1500, which is what dredge was at when i got into it in 2013
noble fish with just an ancestral is about the same cost as dredge
legacy lands is 4-5k, mostly in tabernacle, diamonds, duals and drops
legacy UR delver is 2200, mostly duals and then forces
legacy miracles is 1.5-3k depending how many duals you play
legacy grixis is 3-4k
so dredge costs as much as the higher end of legacy decks. if they restricted bazaar and printed snow bazaar or a neutered version then either dredge becomes another strictly bad deck that people play for budget reasons like playing powerless hatebears or it remain the budget deck in the format. let's say the replacement card is good enough, dredge is still a competitively viable deck with 1 bazaar and 4 of the new card, and needs no other reserve list cards- I think bazaar just hits 3 grand in that scenario, as the deck is now force of wills, 400 dollars in modern cards, and 1 bazaar, so people will bid bazaar up as they buy in, and the deck is still cheaper. if the deck is just neutered then the price of bazaar goes down, but I don't think it does much for accessibility of the format if the resulting deck is as competitive as the existing budget decks(powerless hatebears, etc).
restricting bazaar for price reasons is also just a bad idea for the obvious reason that bazaar allows the only viable deck to exist for less than the cost of a lotus, which every other deck needs, most with quite a few moxen. It's not easy to make a hatebear deck that doesn't want lotus and on color moxen, even with null rod effects in it.
Restricting shop for price reasons is just a joke, as a shops deck has over 10k in non shops cards in it given lotus+moxen alone.