Success only lasts for a minute. Sure, you get the rare occasion where a dynasty like the New England Patriots, Golden State Warriors, or the Chicago Bulls dominate their respective sports but even then, nothing lasts forever. Right now, the Toronto Raptors are as successful as they've ever been, but this might be the last time we ever see this exact team together.
The Raptors have everything in place to be successful for the next few years, they're armed with a plethora of young talent and rising stars who can lead the team to glory over the next few years.