if the community support a minimum of 2 DT1 inclusions, it may also not be bad too, but just that it will be harder for people that are in DT1 to get to DT2.
That's not how it works. This is how the number of required DT1-inclusions influences the number of users on DT2:
I counted DT2-inclusions on
Trust settings: there are 33 users with 0 (net) inclusions on DT2, and 308 with 1 inclusion.
Longer list (
Update: this list includes DT1-members (when included by another DT1-member, they're on DT2 too)):
-6: 13
-5: 20
-4: 36
-3: 89
-2: 284
-1: 2723
0: 33
1: 308
2: 94
3: 61
4: 34
5: 23
6: 15
7: 9
8: 7
9: 9
10: 10
11: 7
12: 4
I'd say the minimum should be DT2 strength (2). That removes about half the users, and makes it less of a "burden" to include someone.
I still think "protesting" against DefaultTrust by emptying your Trust list is counter-effective. It may be better to remove DefaultTrust and leave your custom list.