In a world where Google is split up, that'll still be true; it'll look more like "Google CoreCloud has just changed API foo to protect against backflooper attacks; all users must change by Q4 2022." And spin-offs that can't afford the change will kill features or products.
In fact, in a world where individual pieces of Alphabet are required to sink or swim based on their own profitability, I expect more products dead, not fewer. Ads pays for search. Who pays for search in a world where the government has stepped in and divested ads and search from each other?