First up, I think this is great.
Back in 1e I had a campaign were I'd ditched material components, but all wizards as part of their apprenticeship created a focus - either a staff, a wand, an amulet or a ring - which was virtually indestructible and had to be available to cast any spell with a material component. If it was lost or stolen you could only cast spells without Material components until you found it and retrieved it (you could never create a new one).
No prizes for spotting the inspiration there!
I really like this change, it seems to me that it is removing a pointless vulnerability which wizards have always had (the spellbook - which (a) doesn't fit in with almost all fantasy wizards outside of D&Dland and (b) is such a horrific vulnerability that DMs can't take advantage of it without utterly screwing the wizard over, so it doesn't ever actually get stolen or burnt up.)
The only one that stands out as a little strange to me is the Tome, because I find it more difficult to see that being used in the midst of battle.