Indeed. The "experiment" in Portugal is not proving it works everywhere, but shows it can work, which indicates we should study it further and possibly deploy it in more countries across the world, to see if it works elsewhere and if we could possibly make it even more effective.
While Portugal is probably the most famous example of decriminalizing working in humans favor, it's not the only example, it has been employed in other states too. Netherlands has de-facto decriminalized all drugs (in practice, not in law), Czech Republic has decriminalized all (most?) drugs as well.