SOURCE: http://nintendoeverything.com/nintendo-q1-financial-results-fy32018-switch-at-4-7-million-shipped-total/
So during Nintendo's financial report, they highlighted some figures for the Switch and 3DS. Interestingly enough, they decided to mention the following:
"For Nintendo 3DS, Fire Emblem Echoes: Shadows of Valentia was released in Japan in April and overseas in May and has been a popular title."
Could this be an indication that Shadows of Valentia sold much better than previously expected, or is this just Nintendo PR speak for the 3DS? Perhaps IS will be willing to remake other games in the series if this game was considered "popular" by Nintendo.