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OneDrive is much better than the Dropbox, Onedrive give you Unlimited space with Office 365 for $70 year
I don't think it's that easy.
First, if the "need" for it isn't very wide-spread then it might not be lucrative to spend development resources on it. The usual/default User will probably not even use the 2 TB plan for just some files and pictures.
Second, as with all "unlimited" offers of anything - there is risk of abuse. While a good chunk of the userbase will probably behave in a predictive manner and just slowly rise in what space they need - there will also be those that will try to use that unlimited space to their advantage and Dropbox's (or their userbases') disadvantage.
But i'm convinced that everybody is aware of the above - so consider it just writing down what everyone already knows.
What i will say is that with the advent of Dropbox advertising itself as a "Backup Solution" the needed storage space might go up a bit. There is a difference between synching a few select files between some Devices and backing up your PC for example. Even less technical or "specialized" Users might have stuff lying around on their PC that amounts to larger volumes of data then they'd need if they pick and choose.
If you really need unlimited space from Dropbox and you have the coin you can already get unlimited space -> buy the advanced team account. What we're asking for here is a more affordable option of unlimited space for an Individual - otherwise everybody here would just go and buy the advanced teams option. How do you calculate a price that facilitates that for an individual, covers their costs and prevents or factors in abuse?
While maybe not a technical issue, it sure is an organizational/accounting/billing one. We'd not be happy if the end result is them having to raise the price after very short time just because they figured out that it doesn't work after the fact.
And as always - if it's free then you're the product.
So i'm happy for them to try to figure something out that works for everybody in their own time. But i'm ofc also VERY happy if that doesn't take too long ;)