Drewsmon thanks, now I can gauge what dose he is actually receiving.
We were using a strength of 5mg per 5ml.
So if you give him 1ml he is receiving 20 mg, but giving .25 he is receiving 5mg. This is a really tiny dose and will not depress his breathing at all.
Chris went up to around 30mg per dose at the end and it wasn't depressing his breathing, which was very shallow at the time and he was also having clonazepam which can depress the breathing.
Over time a resistance does develop and so higher doses are needed, but that doesn't happen over days. In fact, when small doses are given with good effect it often takes quite a while for resistance to develop.
By giving him so much less than the dose he can receive now, you are dosing to effect and if this small dose is working well stick with it, but don't be afraid to raise it if he needs it as you are only a quarter of the allowed small dose.
Chris took the 5mg at night for many months and until the pneumonia and then end stage it worked for him. The increase in his doses wasn't because of any resistance to it, it was because he needed more as his situation changed. Taking small doses of morphine also did not have any effect on hastening progression or taking his breathing down faster.
So now, to answer your original question - I would not see starting a small morphine regime like this as meaning the end is near.
Many people think that morphine is a sign of the end, but it's actually a great palliative drug that can be used for a very long time in many illnesses.