Rankings tournies are already limited to three per country, selected by USAW
Next year that changes to two per country, and USAW is getting ahead of the changes by moving up the selection process. USAW selection changes all but say out loud "WTT finalists are going to the rankings tournaments. We aren't having a Zain Pan Ams moment again."
But that also removes the rest of the ladder from attending rankings tourneys. Guys can still attend non-rankings events (Deglane, Spanish Grand Prix, etc) but this is the downstream effect of the changes.
On the bright side, this means that, in theory, there will be more high-level participants at the senior level and less of the Taylor/Dake go to worlds then don't compete for another 364 days types (again, theoretically).