YAWN.
"Public service workers."
This pick will certainly be 100% behind shoring up public sector union pensions at taxpayer expense (CA, IL, NY). He might (!) give us the favorable nod when it comes to RLA activity, although the first time Congressman X or Senator Y gets delayed or mildly inconvenienced, that'll be the end of that.
The billionaire class isn't about to back a renaissance of blue collar private unions, stop offshoring of manufacturing, or flooding labor markets with cheap labor (be it in the fields or in high tech). Unless you think he's going to stop Bezos from whipsawing between vendors, and big tech from importing brainpower at 1/2 price, or collusion among techies to keep wages down by disallowing talent "poaching".
Caesar Chavez (a true labor man) understood that private sector unions are pointless if the labor supply is effectively infinite. That's unquestionably the direction this country is going.
Good for GDP. Good for "the economy", if the economy is only GDP. Definitely good for all of our 401(k)'s. But good for blue collar, private sector union formation...not so much.
If unions are the goal, historically speaking, asking nicely of any political class has not been the solution. Labor v. capital has always been a pendulum swing; I don't see this particular administration (or any in the past 40 years) being a true friend of labor.