One of the best games of the day today was 100% meaningless, as defined by most as it's affect on the playoff relevance of the participating teams. Every game is meaningful to players and coaches who want to ensure their services remain desired by the team they play for, or want to put a good performance on tape for prospective future employers when the business side of the game dictates they go elsewhere.
Colts were well into their 'meaningless games' when they broke their futility streak, and then beat a team that's hosting a playoff game next weekend (instead of potentially enjoying a bye).
With the last 2 weeks loaded with division games, 2 more games would add 2 more weeks of drama and jockeying for position within your divisions... and those playing 'meaningless' games are provided more games to show that the characterization doesn't mean as much as people would like it to just as the Colts did vs the Texans and the Seahawks and Cardinals did tonight.