Good catch! I do think it is a solution yes. It's no guarantee of course, but nothing really is. Talent trumps just about everything else in the NBA. If it doesn't all gel together, you can flip it for other assets that may gel together. However, if you don't have talent, you don't have anything.
Your point about age is a good one. I think the plan is to keep these guys together and grow them all together, so a few years from now the team will be mostly the same core pieces but they won't be under 22 anymore.
At the point the hope is that they have learned how to win. Personally I think if the suns had gotten Lonzo Ball this year it would have made a big difference in the win/loss column. Bledsoe is a good player but he doesn't make anyone around him better.
The suns have scorers... they just need someone to set them up. If they find the right point guard I think this team turns around in a hurry.