Remove dfm and the views will suffer , remember that CR screwed up the paperworks so DFM had to fill in in the end.
And CR is the Far popular org by all metrics. Not to mention you have orgs like murash and riddle still lurking in Tier2(although they lacked the business and history like dfm and zeta).
You have at least 40k loyal fans who will watch zeta and dfm and that's not even talking about watch parties or if any of zeta and dfm even qualify for masters. These numbers are nothing to sneeze at, even in T2 Valorant you will get similar if not more than t1 itself
After all that investments into the Jp t1 and t2 I doubt the japanese fans would like it if their spot got reduced to 1 and riot probably knows that.