From the Amtrak Five Year Plan, vague as it is, with no specific timeline established:
Standardize the designs and elevate the offerings of all station lounges, now branded as Metropolitan Lounges, to enhance the customer experience with the current and next generation customer in mind.
I think that the lounges will eventually 'homogenize' into a standard level. The new one in New York is getting a big push as part of the hype of the new train hall...that will probably fizzle in due time....So far, the only lounge that has actually provided any alcohol is Chicago. We shall see what actually opens in NYC and how long it lasts.