That’s been an issue that has been remedied in recent years, with both remakes and reinventions a big part of what’s been driving Scientific Games forward.
Others, like WMS, didn’t see their games being updated for new cabinets, and so as casinos removed the old machines from the floors, the games were disappearing. Some of their subbrands, like Shuffle Master, succeeded in keeping their popular brands out there and doing brand extensions (think 88 Fortunes).
Scientific Games has been a company that’s been in some ways a bit uneven until recent years.