Financially, the WNBA sort of sits in purgatory. They seemingly make enough to not go under, which in itself is an accomplishment. But, they don't make enough to offer player salaries that would convince many of them to stay at home after the season.
As an exercise, I tried to think how much more money would it take to make the players...comfortable, at least, if not wealthy.
The 2019 team salary cap is $976,300, meaning that the league as a whole is capable of paying a little under $12 million (just for information's sake, it's about equal or less to the top 120 NBA player salaries). It's safe to assume that if they paid much more than this, the league would become non-viable. The WNBA doesn't get the massive subsidies that come with being associated with wealthy overseas sports clubs or oligarchs.
But let's say that the WNBA surges in popularity and revenue, and instead of a salary cap of $976,300, you have a salary cap of $2 million in 2019 dollars ($24M for the league as a whole). Now it becomes feasible to pay a team of 12 as follows:
1. $300k*
2. $300k*
3. 200k
4. 200k
5. 150k
6. 150k
7. 150k
8. 125k
9. 125k
10. 125k
11. 100k**
12. 75k**
*Hypothetical new max player salary of $300k **Rookie scale salaries
With a $2M cap, you can now pay franchise players up to $300k (max), average non-superstar vets an average of about ~$150k, and a new rookie scale of $75-100k or so. Or you could reduce the average non-superstar salary a bit in exchange for boosting the max to $350 or $400k. Not NBA money...but not bad for a summer's work.
Obviously, players will still go overseas a ton, especially if they're the superstar-caliber players that can get much bigger paychecks. But at these higher WNBA pay levels, the typical WNBA player would at least have a bit more money to (hopefully) invest or splurge with. Or at the cost of no overseas salary, they could more easily use the long WNBA offseason to go back to school or be earning experience toward a future career.