Earlier quoted context omitted.
JCPOA only had temporary enrichment limits, which would end in 2030, after which Iran could enrich freely. It did not permanently stop enrichment. If JCPOA was followed by both Iran and the US to the letter, we would face a similar crisis to the one seen today, except around 2031-2035.
Unless agreements are renegotiated and extended, of course. What matters is ongoing engagement and monitoring, it's a far more tractable position than standoffs with zero knowledge or interaction.
Claiming "agreements are renegotiated and extended" is hypothetical. What incentive does Iran have to agree to enrichment caps post-2030? Why would Iran give up its strongest negotiating card, its nuclear program?