If you’re sure you want accounting, don’t go to a UC that doesn’t have an undergrad accounting major. It’s not just a matter of being admitted undeclared, it’s that even the closest major UCSD offers would be a compromise. SJSU has a well-respected program and great connections in the Bay Area for internships, etc. A top CSU vs. a UC isn’t going to hold you back in a business/accounting career.
A waitlist is a waitlist, not a rejection (Excellent article on what a waitlist is and is not)… but there’s no assurance of an offer from UCI, as you know. Try to put it out of your mind and get excited about where you’re committing. (But also, don’t get sloppy about checking your email - the window to respond if you do get a WL offer is quite short.)