There was no appreciable devaluation from the move. The new reprints honoring old cards that they promised not to reprint were not actual Magic cards, they have an alternate card back that makes them not Magic cards, not tournament legal, and a completely different class of cardboard for collectors. (Heck, plenty of players and some collectors actively want Magic to go back on that promise—called the "Reserved List"—because it prices otherwise-potential players out of playing certain forms of the game.)
As an example, let's examine, one of the cards they printed an homage to is Volcanic Island--the most-available, lowest-cost real English Magic printing (Revised). Its average price on Oct 1, a few days before the 30th anniversary announcement, was (according to mtgstocks.com) $799. Its average price today is $779 (the $20 difference is within normal seasonal variation). A more-collectible printing, Unlimited, had an average price on Oct 1 of $1342.50. That's its exact average price today. The much-more-collectible Beta printing was $12,500 on Oct 1, and $14,999 today.
No, the uproar from the community had much more to do with the way they marketed and sold the product in which these homage prints existed, the way their messaging about its sales performance seemed sketchy, and most importantly the price of the product.
