Well, I think you can overdo it. Yang's proposal was $1k/mo, which seems more like the sweet spot.
We've already seen this happen with the US Social Security program. Why repeat something that is known not to work?
It'd need to be indexed to something or have other hard controls to prevent that spiraling: "Vote for me, I'll increase it to $2k" "No, vote for me, I'll increase it to $3k!"