Not really. There will be many small/mid level studios that need large storage solutions that will still use the Intel MacPro systems because MacStudio cannot give the same PCI-e expandability. One of the main reasons is HBA cards (ATTO, High-Point, Areca) to expand storage solutions based off large multiple RAID arrays of HDD or SSDs. Thunderbolt 3/4 might boast high speeds, but reliability and sustained read/writes perhaps not as much.
I am still using the MacPro 5,1 primarily because of how easy it is to expand storage solutions through internal PCI-e slots based HBAs. Agreed memory/processor bus speeds are frozen for many years, however, once invested in a lot of internal and external solutions, these small/mid studio will not reinvest for probably another 5-8 years depending on their profit margins and investments.