This is exactly the problem with OCSP. There's no way to tell if the remote server is down, or if a malicious actor sitting in your path is blocking it. So your browser can either a) make it super easy for all your OCSP-using sites to appear down, which will encourage users to use other, non-OCSP, sites, or b) silently fail, which makes the entire exercise pointless.
Stapling only partially mitigates this, as it doesn't currently work with intermediate certs, and at this point most sites have at least one intermediate cert.
Stapling only partially mitigates this, as it doesn't currently work with intermediate certs, and at this point most sites have at least one intermediate cert.