Personally, I doubt it. I did a lazy search on the topic and found complaints that date back five years regarding Christmas decorations going up in October. Guess what folks? It's not new! In retail, Thanksgiving isn't a big holiday. Christmas, however, is. As is Halloween (it's rising through the ranks, and I think has broken into the top five: Christmas, Mother's Day, Father's Day, Valentine's Day, Halloween -- that's from memory, so don't quote me). Christmas decorations go up before Halloween comes down because that's how retail does things. Displays sell things...the next set begins its rise before the prior set is stripped down. Stores don't do naked. That's just the way it goes.
What about personal homes being decorated earlier? Really, I doubt this one, too, though some people might be spreading out their decorating tasks over a longer period of time. I remember my mother commenting (note: not complaining) about two families in our neighborhood who started decorating for Christmas on November first. I'm not a spring chicken...if these two neighbors were the first folks to decorate for Christmas prior to December (which I higly doubt), then it's been going on for at least 40 years.
Retail decorates early. They always have, they always will. People decorate early. They always have, they always will.
If you see someone decorating for Christmas in June, I'll be willing to take complaints at that time.