I believe they could be, although some adjustments would have to be made. I generally think about the IUCN definition of MPAs, which includes that they need to have long-term legal protection. Right now the RCAs are under the Fisheries Act, so technically they could be changed quite easily. One of the things that would need to be potentially changed is to ensure that they actually would be there for the long term.
I also think they would need more active management to be effective. As I was saying, the recreational fishers don't know where the boundaries are. However, for the commercial fisheries, they are as compliant as can be. Their vessels are monitored through the vessel monitoring system, so compliance by the commercial sector for not fishing where they're not supposed to within the RCAs is excellent.