Hooterdear said:
...there is one thing that bothers me more than anything else: inexperience.
Here is rundown of confirmed and rumored directors for the upcoming Star Wars films:
Film
Director
Age
Directorial Debut
Number of films
VII
JJ Abrams
49
2006
4
IIX
Rian Johnson
41
2005
3
IX
Colin Trevarrow
39
2012
2
Rogue One
Gareth Edwards
40
2010
2
???
Josh Trank
31
2012
2
Han Solo
Phil Lord, Chris Miller
39
2009
4
There are plenty of very respected directors, preeminent in their field, who directed very successful films when they were either younger or had less experience (or both) than the directors in your example. The films below launched careers and in some cases became standard-bearers for their genres.
Film Director Year Age Debut Films Prior
Jaws Spielberg 1975 29 1971 2
Star Wars Lucas 1977 33 1971 2
Taxi Driver Scorsese 1976 34 1967 4
Night Shift Howard 1982 28 1977 1
Do The Right Thing Lee 1989 32 1983 3
Stand By Me Reiner 1986 38 1984 2
Alien Scott 1979 41 1977 1
Not sure about the actual point of your discussion because your examples are hollow. If you don't think you'll like The Force Awakens, don't go see it. I saw Phantom Menace and never bothered with the last two films or any of the SEs. Star Wars as a franchise isn't required viewing.
If your argument is that you're some sort of completionist who has to see everything and have it all fit together happily, then you may have a problem on your hands. You might want to give some serious thought to making peace with a multi-format, multi-author, multi-director franchise spanning 45 years.