Here is a modest proposal for the USTA, rather than spending $500,000,000 on a stadium renovation:
1) Sponsor more Futures tourneys in the USA. Increase the subsidy (currently) 50% of the prize money) to 100% to lure more clubs into sponsoring. The clubs still have to pay officials and other expenses, so it takes a lot to attract more clubs. A local corporation could pay for the officials in return for placard advertising, draw sheet advertising, etc., which often happens. You could come up with a 40 week Futures schedule each year, with some geographic grouping so that travel is lessened from one week to the next.
2) Hire a fitness trainer and a physical therapist, and have them attend the 40 Futures events. Their services are free to USA players at the events. The USTA has to pay travel expenses for these two employees, of course.
Total expense: About $1,000,000 a year for the men and the same for the women. With players getting some small sponsorships for rackets and string, it would become possible for players to attend 20-30 Futures tourneys a year, staying with local families from the clubs, without spending a fortune.
Sounds like a good investment in American tennis to me, unlike the stadium renovation, which means ABSOLUTELY ZERO to me as an American tennis fan.