Only in countries that will cling to welfare programs.

If AI becomes so good that it takes 90% of jobs won’t the majority of the developed world cling to welfare programs?

One would think

They can either cling to welfare programs or stay developed.

I'd argue that to be considered a developed country, you need to be able to support your population. Being able to provide social safety nets stopping your citizens from falling into poverty is a sign of being developed. There's a reason that the HDI (and IHDI) exists separately from GDP.