(I know all character classes can use Protection scrolls; this thread is about 
spell scrolls.)  In my last 5E game, spell scrolls were largely ignored.  I'd like to make them more important and useful in my next campaign, and I think this might be a good way to go about it.  What do you think?
The General Idea:
All characters (and certain monsters) can cast spells from scrolls, with a successful Intelligence (Arcana) check.
Basically: if you can read and speak, you can cast spells from scrolls.
The Details:
- If the spell on the scroll is a spell you can normally cast, no check is needed.
 
- Otherwise, the DC is equal to 10 + the spell level.
 
- The character must be able to see, and have enough light to read by.
 
- The character must be able to speak.
 
- The character must be holding the scroll in one hand at the start of their turn.
 
- The casting time, duration, effect, and concentration is unchanged from the spell description.
 
- On a success, the scroll is consumed and the spell is cast as normal.
 
- On a failure, the scroll is consumed and the spell fizzles without effect (or, at the player's discretion, the character may roll on the Spell Mishap table for a random effect.)
 
Why Am I Doing This?
- I want spell scrolls to be more useful.
 
- I want spell scrolls to be more interesting (if the player wants).
 
Potential Consequences:
Bards and Wizards will be better than other non-spellcasters, thanks to their high Intelligence, their broad spell list, and/or their Jack of All Trades class feature.  I'm not sure if this is a 
problem, per se, but it will definitely have an effect on these character classes.
It's ripe for abuse in the hands of certain players.  I can see at least one of my players building a "scroll factory" wizard and cheesing the game with scrolls of Haste, for example.
Others?