I apologize for the jaded take here, but I just feel any time they announce something like '5 years of content updates,' or '5 major DLCs,' I get my hopes up. But companies almost always fizzle out or see diminishing returns on the horizon and give up early. I was so pissed when Bethesda said they would do 5 major DLCs for Skyrim (lol). Recently my cult favorite Mechwarrior 5 got cucked by its publisher and all it's 3 years of future content update likely scrubbed (for fucking LOTR online of all shit). Some might argue Red Dead Online. It's always a gut kick for us enthusiasts. I would also include games that still get content but it's so mediocre, it makes the game worse (Payday 2, Guild Wars 2).
Anyway, I hope you do get those 5 years.