sounds like a good way to die. makes me think of the show called dead like me. some scene with the younger sister and her goth friends are talking about how they want to die and it's all these gruesome deaths and the mother says Peacefully, Surrounded by Loved Ones....but yep it does seem like how to die, being that they were there in the life lived.
A lot speak of whiteness being the door to the afterlife/the unknown/the Godhead/whatever you want to label it; blue, if we are speaking of the meaning behind colours again, denotes/connotes spirituality - I think you capture both here quite incisively.
Overall, this is tinged with regret. I see this as a characterisation of an old man on his deathbed, thinking about what-ifs, what-never-happened and what-could-never-be. It's sad but most of us will feel this way, that we never quite made the most of life and wish that we had lived past moments more vicariously and with that essence of joie de vivre.
"Milk-misted" - I like that for its double meaning (to me): cataracts, physically; and a melancholic heart, emotionally.
it leaves the end open to interpretation...yes we go to that place in the sky at the end, alone...but also the blue way can stand for all those we leave behind..the grief they share, the blue they feel at the loss.