Calvinbezza,
Let's try this a different way. In your opinion, what other options would a conservative RCA congregation have if it wanted to leave the liberal RCA but . . .
* be part of a fellowship that still held to Reformed confessional standards.
* be part of a denomination with more than a few hundred churches (to facilitate the sense of familiarity with what they had been used to in the RCA).
* be part of a denomination that is conservative without being perceived to be insular or ingrown.
You throw up impediments of seminaries (even though any departure from the RCA would involve different denominational seminaries), culture (but what conservative denomination of a similar size would have a Dutch culture?), broad ecumenical affiliation (but isn't that one of the reasons why the congregations are seeking to leave the RCA?), and differences of confessional subscription (but are there ANY conservative TFU denominations that meet the first three criteria listed above?).
Changing denominational families is NEVER easy, whether for a congregation or for an individual. ANY change will bring adjustment pains. However, much as a person trying to select a church in a community that does not have a congregation of one's denominational preference, congregations must consider a variety of criteria and make the most satisficing decision from among the options available.