I do like the ability for non-casters (and casters who don't have that spell on their spell list) to be able to read scrolls, but it definitely should be a difficult skill check. There's no "Use Magic Device" in 5e, so maybe an Arcana check with DC = 15 + spell level? A failure results in the loss of the scroll. [...]
But there is the Magic Initiate feat and Multi-classing which mechanically represent just that: dabbling with magic.
Arcana refers to knowing about magic, not actual skills with it, and it would be good to keep it that way so things don't get mixed up.
That's why I'd want the DC to be high-ish, so that this doesn't replace that feat or multi-classing. The description of a spell scroll is: "a spell scroll bears the words of a single spell, written in a mystical cipher" and that the spell not being on your list makes the scroll "unintelligible." I'd argue that Arcana (knowing about magic) is the appropriate skill to be able to read that cipher. Perhaps you, in your academic studies of magic, came across that cipher/those words and are able to read them correctly.
The spell is already in the scroll; so as long as you can read it, you can cast it. You basically just are following a recipe.
