I'm fortunate enough to still have my full collection of RB4 instruments functional after all these years, and I frequently bust them out with my wife and my friends when the booze hits just right.
In the announcement they really emphasize that you'll keep the songs you've already bought. What they haven't clarified is whether you'll still be able to continue downloading dlc tracks that are already released. Severing that from the playerbase would really suck.
Although they are releasing one final DLC pack before this ends, so who knows?
"When life promises you lemons as a child and drills into your head the importance of preparing to make lemonade because the lemons are coming and you've got to be ready and get the sugar and the water and the ice ready because you're totally gunna get those lemons and have a lemonade-based future of stability and fulfillment and happiness, prepare to be blamed when the lemons don't arrive."
That's one kickass album cover.