Your argument underlie some implicit assumptions, which are that (a) a BI that increases over time has negative consequences, and (b) these consequences would b

Your argument underlie some implicit assumptions, which are that (a) a BI that increases over time has negative consequences, and (b) these consequences would be invisible to the people. Those seem some pretty strong assumptions to me, and they deserve to be further justified. Why do you actually think that making the BI larger is a bad idea? And why do you think that people will disagree / not add one and one together? If you think that increasing the BI requires tax increases, well, there will be people complaining about the tax increases, and your argument goes poof. If you think that increasing the BI causes higher inflation, then either people will decide that having a higher BI is worth it, or there will be people complaining about the higher inflation, and your argument goes poof.