Contrary to common belief even among the experienced, average quality of roleplay has gone down over time. It's a numbers game driven by standards, and it starts with the factions scene.
The more players you have the more factions you will have. When you have high standards, factions strive and compete to meet them. The more factions you have the tougher the competition. During the “Golden Age of LSRP” you had unofficial factions that would significantly outperform today's official factions in almost every metric you could compare them by.
Really the only metric present-day roleplayers have the old-timers beat is realism. However realism is a double-edged sword because you can reach a point of overrealism. Playing to imitate real life for screenshots defeats the purpose of roleplay and, the rose-colored glasses aside, roleplay was best when people logged in and improvised. They were more active in-game than on the forums. Organic development was based on IC events.
Now, I'm not here to hate on people who log in for 2 hours a day, manufacture a roleplay scene, take screenshots for their topic, and call it development. Everyone should have the creative freedom to roleplay what and how they want. However people who do that aren't at liberty to complain about declining standards when they don't set a good example for the new generation themselves.
The best roleplayers I ever met never shied away from genuine interactions and making the best of a bad situation in terms of what was available for roleplay creation. People adjusted to the game universe and got creative. What the old-timers had figured out is that we were having fun living out our fantasies and making memories. We cared for realism just enough to provide structure for our roleplay but not enough to curb our youthful enthusiasms.
People think their roleplay is the best and only right way to roleplay. It's not. Roleplay is subjective. What's fun or interesting to someone may not be fun or interesting to someone else. If more people understood that, embraced it, and weren't afraid to take an L every once in a while the server would be a better place for everybody.
To answer your question, the Golden Age of LSRP will never return. SAMP is the past not the future. Though we can enjoy it while it lasts.