the (smaller) Star-member-airlines with less routes, less coverage, (and less/no NorthAmerican competition in their main markets), will not agree.
Anyway, the real big advantages of being 1K are only good on UA and are a typical NorthAmerican-competition 'thing' (6 systemwide upgrades, free Shuttle upgrades, NorthAmerican confirmable one-way upgrades); and that's a lot compared with the 'gifts' for the top-tier members of all other Non-North-American StarAlliance members.