VGChatz's Taneli Palola: "There's no question that during these years the overall popularity of the genre took a significant hit, as most games within it specialized even further by adding new elements from other types of games into their gameplay loops and consequently became increasingly niche as the years wore on.
However, this doesn't in any way mean that the period was devoid of great games. Quite the contrary, in fact. Arguably some of the greatest RTS titles ever made came out around this time, and much of this was because many developers were increasingly familiar and comfortable with adding new twists and gameplay elements to the familiar formula. As such, even when the genre's popularity dwindled, many studios were still creating excellent and groundbreaking titles almost every year, just for a smaller audience than in years past."
Despite being barebone ports of the originals, Pikmin 1 + 2 are still great on the Nintendo Switch, bringing all-numbered entries of the franchise onto the platform for fans to enjoy.
Halo Wars is still widely considered one of the best and most accessible RTS games around, and that formula could work with other Microsoft IPs.