I don't think there is any case to answer here, Rugby League is a squad game played throughout 30+ games in a season, if you choose to blood a few younger players then it is entirely your call.
From a Widnes point of view I don't think any talk of a weakened side will matter, you can only beat the side in front of you and I'm sure everyone at the club is delighted to get off the mark in front of a big crowd at home against Wigan. They came from behind in both halves and will take a lot of confidence from that.
From Wigan's point of view, these dropped points aren't going to mean a great deal in the grand scheme of things, they will still be there or there abouts come finals time and hopefully have their top players fit and ready for the business part of the season. On top of that they have introduced a number of their young talented players to first team rugby, of course mistakes will be made but the kids who played today will take a great deal from this game in the long run despite initial disappointment with the result.
Look at the end of the day we've ended up with what sounds like a fantastic, competitive game of football involving a high number of young British players.