The bass populations are being affected but trying to pinpoint a specific reason is, at best, a shot in the dark. Consider this:
-Recent hurricanes have adversely affected gov't fisheries tasked with seeding sportfish fry all over the state.
-Last years historic freeze wiped out many ecosystems of both invasive and native species.
-Nutria and other herbivorous invasives have remodeled ecosystems affecting local food chains.
-Land development, agriculture, damming, and available groundwater resources continue to nibble away at surviving ecosystems.
-Even with current practices of catch-and-release, steel weights, and barbless hooks, native populations have to contend with hundreds of years of pollutants left in their waterways from old practices of cut lines, lead weights, trash thrown overboard (including oil cans, lead batteries, etc).
Basically, ask 10 people for a specific reason that bass populations appear to be on the decrease and you'll get 10 different responses due to all of the pressures placed on their ecosystems.
And, I have yet to hear or read from a credible source that there is, in fact, a hybridization success between Micropterus sp. and Cichla sp.