Lucha Underground's days may be numbered as the current owners are unwilling to fund the next season unless they are able to raise capital with a new round of funding by bringing in additional investors. Lucha Underground has been aggressively courting potential investors, in the hopes of taping season four in the middle of November, which would then begin airing in late January 2018.
The Lucha Underground roster has been extremely frustrated by the lack of communication, but nobody in the company wants to admit the company may shut down if they can't find funding and there's no way to know for sure one way or the other if they'll be able to secure a new investor in time to make a late 2017 taping schedule a reality.
WWE has been paying close attention to the situation as there are several wrestlers under contract to Lucha Underground that WWE would be interested in if they hit the free agent market. Many are locked under lengthy draconian contracts that commit them to several more "season cycles," which at this rate could be as long as another five years.