Licensing is something that you deal with after you get hired. I'm sure it happens but I've actually never heard of anyone getting denied a license in Nevada. There is a fee but it's under $100 if I remember correctly and I don't even think you have to wait after applying. You fill out an online form and are allowed to work.
Yes there is a huge need for dealers this time of year. The problem you'd run into is that they've already done their auditions, HR onboarding, training, and uniform stuff so it's more work for them to bring on new people, especially those who have not worked in a casino or tournament series before.
This group has the guy who does the WSOP hiring and many past and present WSOP dealers who know a lot about other rooms that might be hiring for the summer:
https://www.facebook.com/groups/WSOPdealers