Srila Prabhupada:
"One who has got a helpful wife at home does not require to accept sannyas. We are concerned more for Krishna Consciousness & if that work is executed more nicely by cooperation of husband & wife, there is no necessity of thinking wife as impediment."

Thank you to Devaki mataji
Thank you to Devaki mataji for bringing up this discussion here. Thank you also to my godbrothers Phanisvara and Vijaya Venugopala prabhus for their very valuable and enriching answers.
One thing I would like to add to this discussion: In Germany we have some groups that are called "Bhakti-vriksha groups". But if we have a closer look at what they are practising we can easily see that some very essentiell BV-principles are missing there and what they are doing is in the best case a small "shadow" of BV but not more. Even often local BV-leaders are not properly trained and educated in BV at all. So, if we are judging BV according to how devotees try to implement it, we may get a completely wrong impression and understanding of what BV really is because not everybody is walking his or her talk.
Better to learn BV from such longterm, successful and expert BV-preachers like Vijaya Venugopala and Prema Padmini prabhus than judging BV according to how other devotees who are less successful understand and implement it.