If teeth are weaker, can you still get porcelain veneers?

Hi, thanks for sending your question. Its important to note that just like any other dental restoration you need proper maintenance such as brushing, flossing and regular check ups and cleanings with your dentist to maintain your veneers in good condition. Often times veneers can be an added strength to already weak teeth. Consider a comprehensive examination and xray to determine the best rout of treatment for your teeth. We would be happy to see you in our Irvine office. All the best.

Hi:Just like any other dental restoration, porcelian veneers have to be maintained by proper oral hygiene. If there is any cavity, in most cases the veneer can be repaired or in worst scienerio replaced with another veneer.Best,Dr. Maddahi

Bonding vs veneers is a common question, and although many people can advise you, you are right that it is always the underlying teeth that need to be safeguarded.
The teeth under bonding are largely intact, but still they can get decay, and if you do not floss you can get gum disease. This is exactly the same as with veneers. 
However with most veneers there is some preparation. There are always the same risks with preparation. 
With heavy preparation the tooth can die and require root treatment which makes it more likely that at some point that it will fractureWith light preparation there is still the risk of leakage and staining and eventually decay. The veneers themselves can break and require replacement.
For either treatment you need to take responsibility to keep your teeth healthy, that means flossing, brushing and very regular checkups and hygiene. 
Good luck with whichever treatment you choose - 
Kind regards
Thomas Dey, BDS, MSc