tl;dr: the actual length of the supermajority was a few months, which they spent working on reform for the healthcare industry, where an estimated $2.4 trillion was spent in 2008.
Also, even the Green Party didn’t add UBI to their platform until 2010.
UBI became broadly well known as a policy in the US in 2020 with Andrew Yang’s campaign. It was on the Green Party’s radar as of their 2010 platform. Neither of those things had happened when the Dems had a roughly 6 month supermajority in 2009.
There are plenty of legitimate concerns to have about Democratic policies without expecting time travel from them.
You may not care what Republicans think, but you’re doing their job for them.