Say if one trains as a monk and doesn't reach...

[Mayallbehappy3333]

...liberation or at least stream-entry in this life, would it have been worth the effort put forth living in this way as opposed to living as a layman that abides by 5 precepts, practices meditation/mindfulness, and makes a great effort towards the supporting of the Sangha?

One would maybe have more time and focus dedicated to the practice, meaning that perhaps the mind could be purified further than that of a layman.

If the state of mind has an effect on future births and one is reborn again as a human, will that person pick up from where they left off?

Thank you very much for taking the time to read this.

[Alex123]

...liberation or at least stream-entry in this life, would it have been worth the effort put forth living in this way as opposed to living as a layman that abides by 5 precepts, practices meditation/mindfulness, and makes a great effort towards the supporting of the Sangha?

One would maybe have more time and focus dedicated to the practice, meaning that perhaps the mind could be purified further than that of a layman.

If the state of mind has an effect on future births and one is reborn again as a human, will that person pick up from where they left off?

Thank you very much for taking the time to read this.

By becoming a monk, IMHO, it cam build a good predisposition (to become a monk that will succeed) in the next life - and all the dana given to you by the lay followers will benefit them. So also consider the merit your ordination will give others.

[Bundokji]

The practice for both monks and laity do not regard the letting go of worldly attachments an opportunity cost.