Address reuse for business
This is more an issue of willingness. 
Generally you are right, address re-use is seen as "should not be done" :-) 
Biggest threat would be, that some bitcoins get "tainted", and loose their value. I leave it to the experts to get this explained. 
With HD Wallets you can generate enough adresses for your webpage/business usage. Just some coding required...

How many public/private keypairs can a Hierarchical Deterministic Wallets (BIP0032/BIP0044) produce? If I got it right, it should be some 2^31 addresses - probably enough for the majority of business cases.